docs: def make_service_url(self):
          """
          Make the service URL CAS will use to redirect the browser back to this service.
          """
          cas_service_url = self.authenticator.cas_service_url
          if cas_service_url is None:
              cas_service_url = self.request.protocol + "://" + self.request.host + self.request.uri
          return cas_service_url